diff --git a/CHANGELOG.md b/CHANGELOG.md
index 264683d2a..4a41b6c8a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -14,6 +14,7 @@ develop
 ### Fixes
 
 - Fix an issue where UNIX scripts could fail getting the content of the document.
+- Workaround an issue where word suggestion in the Touch Bar cannot insert a word starts with a symbol correctly.
 - Address an issue where the application could crash on document saving or text replacement.
 
 
diff --git a/CotEditor/Sources/EditorTextView+TouchBar.swift b/CotEditor/Sources/EditorTextView+TouchBar.swift
index e90dacc66..4da66ff47 100644
--- a/CotEditor/Sources/EditorTextView+TouchBar.swift
+++ b/CotEditor/Sources/EditorTextView+TouchBar.swift
@@ -99,7 +99,12 @@ extension EditorTextViewController {
     func textView(_ textView: NSTextView, candidatesForSelectedRange selectedRange: NSRange) -> [Any]? {
         
         var index = 0
-        guard let candidates = textView.completions(forPartialWordRange: textView.rangeForUserCompletion, indexOfSelectedItem: &index), !candidates.isEmpty else { return nil }
+        guard
+            let candidates = textView.completions(forPartialWordRange: textView.rangeForUserCompletion, indexOfSelectedItem: &index)?
+                .filter({ $0.range(of: "^(\\W|_)", options: .regularExpression) == nil }),
+            !candidates.isEmpty
+            else { return nil }
+        // -> remove words start with non-alphabet to workaround a bug: e.g. "__init__" in Python (2017-10 macOS 10.13)
         
         return candidates
     }